/*
 * Copyright (c) 2002, 2003, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.corba.se.impl.naming.namingutil;

import java.io.StringWriter;

import org.omg.CORBA.DATA_CONVERSION;
import org.omg.CORBA.CompletionStatus;

import com.sun.corba.se.impl.logging.NamingSystemException;
import com.sun.corba.se.spi.logging.CORBALogDomains;

/**
 * Utility methods for Naming.
 *
 * @Author Hemanth
 */
class Utility {

  private static NamingSystemException wrapper =
      NamingSystemException.get(CORBALogDomains.NAMING);

  /**
   * cleanEscapes removes URL escapes as per IETF 2386 RFP.
   */
  static String cleanEscapes(String stringToDecode) {
    StringWriter theStringWithoutEscape = new StringWriter();
    for (int i = 0; i < stringToDecode.length(); i++) {
      char c = stringToDecode.charAt(i);
      if (c != '%') {
        theStringWithoutEscape.write(c);
      } else {
        // Get the two hexadecimal digits and convert that into int
        i++;
        int Hex1 = hexOf(stringToDecode.charAt(i));
        i++;
        int Hex2 = hexOf(stringToDecode.charAt(i));
        int value = (Hex1 * 16) + Hex2;
        // Convert the integer to ASCII
        theStringWithoutEscape.write((char) value);
      }
    }
    return theStringWithoutEscape.toString();
  }

  /**
   * Converts an Ascii Character into Hexadecimal digit
   * NOTE: THIS METHOD IS DUPLICATED TO DELIVER NAMING AS A SEPARATE
   * COMPONENT TO RI.
   **/
  static int hexOf(char x) {
    int val;

    val = x - '0';
    if (val >= 0 && val <= 9) {
      return val;
    }

    val = (x - 'a') + 10;
    if (val >= 10 && val <= 15) {
      return val;
    }

    val = (x - 'A') + 10;
    if (val >= 10 && val <= 15) {
      return val;
    }

    throw new DATA_CONVERSION();
  }

  /**
   * If GIOP Version is not correct, This method throws a BAD_PARAM
   * Exception.
   **/
  static void validateGIOPVersion(IIOPEndpointInfo endpointInfo) {
    if ((endpointInfo.getMajor() > NamingConstants.MAJORNUMBER_SUPPORTED) ||
        (endpointInfo.getMinor() > NamingConstants.MINORNUMBERMAX)) {
      throw wrapper.insBadAddress();
    }
  }
}
